mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 08:19:28 +00:00
168 lines
5.1 KiB
C
168 lines
5.1 KiB
C
/*
|
|
* HP Human Interface Loop Master Link Controller driver.
|
|
*
|
|
* Copyright (c) 2001 Brian S. Julin
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions, and the following disclaimer,
|
|
* without modification.
|
|
* 2. The name of the author may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* Alternatively, this software may be distributed under the terms of the
|
|
* GNU General Public License ("GPL").
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
|
|
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
*
|
|
* References:
|
|
* HP-HIL Technical Reference Manual. Hewlett Packard Product No. 45918A
|
|
*
|
|
*/
|
|
|
|
#include <linux/hil.h>
|
|
#include <linux/time.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/semaphore.h>
|
|
#include <linux/serio.h>
|
|
#include <linux/list.h>
|
|
|
|
typedef struct hil_mlc hil_mlc;
|
|
|
|
/* The HIL has a complicated state engine.
|
|
* We define the structure of nodes in the state engine here.
|
|
*/
|
|
enum hilse_act {
|
|
/* HILSE_OUT prepares to receive input if the next node
|
|
* is an IN or EXPECT, and then sends the given packet.
|
|
*/
|
|
HILSE_OUT = 0,
|
|
|
|
/* HILSE_CTS checks if the loop is busy. */
|
|
HILSE_CTS,
|
|
|
|
/* HILSE_OUT_LAST sends the given command packet to
|
|
* the last configured/running device on the loop.
|
|
*/
|
|
HILSE_OUT_LAST,
|
|
|
|
/* HILSE_OUT_DISC sends the given command packet to
|
|
* the next device past the last configured/running one.
|
|
*/
|
|
HILSE_OUT_DISC,
|
|
|
|
/* HILSE_FUNC runs a callback function with given arguments.
|
|
* a positive return value causes the "ugly" branch to be taken.
|
|
*/
|
|
HILSE_FUNC,
|
|
|
|
/* HILSE_IN simply expects any non-errored packet to arrive
|
|
* within arg usecs.
|
|
*/
|
|
HILSE_IN = 0x100,
|
|
|
|
/* HILSE_EXPECT expects a particular packet to arrive
|
|
* within arg usecs, any other packet is considered an error.
|
|
*/
|
|
HILSE_EXPECT,
|
|
|
|
/* HILSE_EXPECT_LAST as above but dev field should be last
|
|
* discovered/operational device.
|
|
*/
|
|
HILSE_EXPECT_LAST,
|
|
|
|
/* HILSE_EXPECT_LAST as above but dev field should be first
|
|
* undiscovered/inoperational device.
|
|
*/
|
|
HILSE_EXPECT_DISC
|
|
};
|
|
|
|
typedef int (hilse_func) (hil_mlc *mlc, int arg);
|
|
struct hilse_node {
|
|
enum hilse_act act; /* How to process this node */
|
|
union {
|
|
hilse_func *func; /* Function to call if HILSE_FUNC */
|
|
hil_packet packet; /* Packet to send or to compare */
|
|
} object;
|
|
int arg; /* Timeout in usec or parm for func */
|
|
int good; /* Node to jump to on success */
|
|
int bad; /* Node to jump to on error */
|
|
int ugly; /* Node to jump to on timeout */
|
|
};
|
|
|
|
/* Methods for back-end drivers, e.g. hp_sdc_mlc */
|
|
typedef int (hil_mlc_cts) (hil_mlc *mlc);
|
|
typedef void (hil_mlc_out) (hil_mlc *mlc);
|
|
typedef int (hil_mlc_in) (hil_mlc *mlc, suseconds_t timeout);
|
|
|
|
struct hil_mlc_devinfo {
|
|
uint8_t idd[16]; /* Device ID Byte and Describe Record */
|
|
uint8_t rsc[16]; /* Security Code Header and Record */
|
|
uint8_t exd[16]; /* Extended Describe Record */
|
|
uint8_t rnm[16]; /* Device name as returned by RNM command */
|
|
};
|
|
|
|
struct hil_mlc_serio_map {
|
|
hil_mlc *mlc;
|
|
int di_revmap;
|
|
int didx;
|
|
};
|
|
|
|
/* How many (possibly old/detached) devices the we try to keep track of */
|
|
#define HIL_MLC_DEVMEM 16
|
|
|
|
struct hil_mlc {
|
|
struct list_head list; /* hil_mlc is organized as linked list */
|
|
|
|
rwlock_t lock;
|
|
|
|
void *priv; /* Data specific to a particular type of MLC */
|
|
|
|
int seidx; /* Current node in state engine */
|
|
int istarted, ostarted;
|
|
|
|
hil_mlc_cts *cts;
|
|
struct semaphore csem; /* Raised when loop idle */
|
|
|
|
hil_mlc_out *out;
|
|
struct semaphore osem; /* Raised when outpacket dispatched */
|
|
hil_packet opacket;
|
|
|
|
hil_mlc_in *in;
|
|
struct semaphore isem; /* Raised when a packet arrives */
|
|
hil_packet ipacket[16];
|
|
hil_packet imatch;
|
|
int icount;
|
|
struct timeval instart;
|
|
suseconds_t intimeout;
|
|
|
|
int ddi; /* Last operational device id */
|
|
int lcv; /* LCV to throttle loops */
|
|
struct timeval lcv_tv; /* Time loop was started */
|
|
|
|
int di_map[7]; /* Maps below items to live devs */
|
|
struct hil_mlc_devinfo di[HIL_MLC_DEVMEM];
|
|
struct serio *serio[HIL_MLC_DEVMEM];
|
|
struct hil_mlc_serio_map serio_map[HIL_MLC_DEVMEM];
|
|
hil_packet serio_opacket[HIL_MLC_DEVMEM];
|
|
int serio_oidx[HIL_MLC_DEVMEM];
|
|
struct hil_mlc_devinfo di_scratch; /* Temporary area */
|
|
|
|
int opercnt;
|
|
|
|
struct tasklet_struct *tasklet;
|
|
};
|
|
|
|
int hil_mlc_register(hil_mlc *mlc);
|
|
int hil_mlc_unregister(hil_mlc *mlc);
|